package main

import "fmt"

func ifTest() {
	var age = 20
	if age <= 18 {
		fmt.Println("age under 18")
	} else if age <= 45 {
		fmt.Println("age under 45")
	} else {
		fmt.Println("age over 45")
	}
}
func switchTest() {

}
func forTest() {

}
func main() {
	ifTest()
	switchTest()
	forTest()
}
